LCD screen: 2.5 inch TFT * AA Battery Powered (about 1700 views that last 10 seconds each) * 2.0 Megapixel viewer (this product does not take pictures or video) * Viewing Angles: 54 degrees (screen) and 150 degrees (peephole) * Door thickness: will fit 35-75mm (1.38-2.24 inches) thick doors.